2019-08-19 PS
rwGRIB2.f90 subroutine readlatlon: check alloc status deallocate values
  - in case of empty input file 
  NOTE: check why we run into that at all!
  Improve by realloc only if dim has changed

2019-08-21 PS
  introduce the "new" versions of source files: 
    all .f90 free format
    code beautification
    regression test is OK
  
   make new local gfortran makefiles, remove parameters not needed anymore
   
   change filenames rwgrib.f90 (all lower), preconvert to calc_etadot,
   adapt messages and comments in calc_etadot.f90
   adapt all makefiles to new filenames
   adapt success message of logfiles in regression test references
   redo regression test OK
   
   provide softlinks for standards:
     calc_etadot.out -> calc_etadot_fast.out
     makefile_local_gfortran -> makefile_fast
   
2022-07-21 AT
   solved issue with emoslib!
   see ticket #312 on flexpart.eu

   identified the source files from emoslib which calc_etadot needs
   converted them from f77 to f90 code
   adapted makefile to get rid of emoslib and make use of the fft source files

   new files: set99.f90, fft99.f90, qpassm.f90, rpassm.f90, jsppole.f90